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Akademiska Hus Carrier CTC / Enertech Donghua University Fastighetsägarna Geotec Grundfos IVT LTH NCC Nibe SWECO TAC Thermia Värme Wilo ÅF- Infrastruktur. OPTIMIZATION OF GROUND COUPLED HEAT PUMP SYSTEMS. Saqib Javed (PhD Researcher) Per F ahlén (Research Leader)

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slide1
Akademiska Hus

Carrier

CTC / Enertech

Donghua University

Fastighetsägarna

Geotec

Grundfos

IVT

LTH

NCC

Nibe

SWECO

TAC

ThermiaVärme

Wilo

ÅF-Infrastruktur

OPTIMIZATION OF

GROUND COUPLED HEAT PUMP SYSTEMS

Saqib Javed (PhD Researcher)

Per Fahlén (Research Leader)

Johan Claesson (Supervisor)

EFFSYS 2 meeting 2009-12-14

slide2
objective
  • Identifying key optimization factors for Ground Coupled Heat Pump (GCHP) systems using modelling, simulations field studies and experiments.
  • Developing simple and user-friendly models and calculation tools to facilitate designers and researchers interested in the complete system optimization.

EFFSYS 2 meeting 2009-12-14

literature review
Literature review
  • Single boreholes: Long term response can be modelled using simple existing analytical models with reasonable accuracy.
  • Multiple boreholes: Shortage of analytical models for both long and short term response.
  • Need of an analytical model which:
    • is capable of simulating both short-term and long-term response of GHE.
    • considers all significant heat transfer processes in GHE.
    • retains the actual geometry of the borehole.

EFFSYS 2 meeting 2009-12-14

case study
Case study
  • Astronomy-House, Lund University
      • Floor area: 5300 m2
      • Heating demand: 475 MWh
      • Cooling demand: 155 MWh
  • Ground system
      • 20 boreholes
      • Rectangular configuration
      • Each 200 m deep

EFFSYS 2 meeting 2009-12-14

simulating multiple boreholes
Simulating MULTIPLE BOREHOLES

Tb = brine temperature

Tw = borehole wall temperature

Tp = temperature penalty from neighbouring boreholes

EFFSYS 2 meeting 2009-12-14

mean brine temperatures
MEAN BRINE TEMPERATURES

EFFSYS 2 meeting 2009-12-14

publications
publications
  • Javed, S., Fahlén, P. and Holmberg, H., 2009. Modelling for optimization of brine temperature in ground source heat pump systems. Proceedings of 8th international conference on sustainable energy technologies; SET2009, Aachen, Germany. August 31- September 3.
  • Javed, S., Fahlén, P. and Claesson, J., 2009. Vertical ground heat exchangers: A review of heat flow models. Proceedings of 11th international conference on thermal energy storage; Effstock 2009, Stockholm, Sweden. June 14-17.
  • Fahlén, P, 2008. Efficiency aspects of heat pump systems - Load matching and parasitic losses. IEA Heat pump centre Newsletter, vol. 26, nr. 3, 2008-08, (IEA.).

EFFSYS 2 meeting 2009-12-14

literature review1
Literature review
  • Single boreholes: Long term response can be modelled using simple existing analytical models with reasonable accuracy.
  • Multiple boreholes: Shortage of analytical models for both long and short term response.
  • Need of an analytical model which:
    • is capable of simulating both short-term and long-term response of GHE.
    • considers all significant heat transfer processes in GHE.
    • retains the actual geometry of the borehole.

EFFSYS 2 meeting 2009-12-14

modelling
modelling
  • Existing Analytical models:
    • Equivalent pipe / cylinder instead of a U-tube.
    • Thermal capacities of the water and the pipe are often ignored.
    • Response is a function only of the distance (r) from the centre of the equivalent pipe.

EFFSYS 2 meeting 2009-12-14

modelling1
modelling
  • New Analytical models:
    • Two pipes in the ground.
    • Accounts for the thermal short circuiting between the two legs of the U-tube.
    • Response is a function of both x and y.
    • Can predict the short time response accurately.

EFFSYS 2 meeting 2009-12-14

modelling2
modelling
  • New Analytical models:
    • Two pipes in the grout surrounded by the ground.
    • Accounts for the thermal properties of both the grout and the ground.

EFFSYS 2 meeting 2009-12-14

modelling3
modelling
  • New Numerical model:
    • Solved the heat transfer problem in 2D using conformal coordinate system.
    • Used for the validation of the analytical model.

EFFSYS 2 meeting 2009-12-14

literature review2
Literature review
  • Single boreholes: Long term response can be modelled using simple existing analytical models with reasonable accuracy.
  • Multiple boreholes: Shortage of analytical models for both long and short term response.
  • Need of an analytical model which:
    • is capable of simulating both short-term and long-term response of GHE.
    • considers all significant heat transfer processes in GHE.
    • retains the actual geometry of the borehole.

EFFSYS 2 meeting 2009-12-14

experiments
experiments
  • Development of a test facility.
  • Experiments to determine:
    • Thermal response for heat extraction and injection conditions.
    • Flow effects.
    • System effects.
  • Validation of the developed models.

EFFSYS 2 meeting 2009-12-14

laboratory development
Laboratory development

EFFSYS 2 meeting 2009-12-14

laboratory development1
Laboratory development

EFFSYS 2 meeting 2009-12-14

brine chilled water system
Brine & chilled water system

EFFSYS 2 meeting 2009-12-14

hot water system
Hot water system

EFFSYS 2 meeting 2009-12-14

ground heat exchanger system
Ground heat exchanger system

EFFSYS 2 meeting 2009-12-14

thermal response testing
Thermal response testing

EFFSYS 2 meeting 2009-12-14

initial results
Initial results
  • Ground thermal conductivity: 3 W/m-K
  • Undisturbed ground temperature: 9 °C

EFFSYS 2 meeting 2009-12-14

conclusions
conclusions
  • Conducted a state-of-the-art literature review.
  • Presented different approaches to model multiple borehole systems.
  • Developing new analytical and numerical methods.
  • Carrying out experiments.

EFFSYS 2 meeting 2009-12-14

questions comments thank you
Questions / commentsThank you!

EFFSYS 2 meeting 2009-12-14

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